Rescue workers cut free a section of concrete floor to lift it up by a crane in hopes of reaching dozens of people believed to be trapped inside a collapsed office building since a 7.1 magnitude earthquake, in the Roma Norte neighborhood of Mexico City, just after midnight Monday, Sept. 25, 2017. Search teams are still digging in dangerous piles of rubble hoping against the odds to find survivors at collapsed buildings. (AP Photo/Rebecca Blackwell)